Preparation method of micro-crosslinked-structure high-temperature-resistant salt-resistant well cementing cement slurry filtrate loss reducer

A technology of cementing cement slurry and fluid loss reducing agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of no guidance plan and low reaction temperature, etc., and achieve strong water-locking ability, The effect of lowering the reaction temperature and increasing the conversion rate

Active Publication Date: 2016-12-07
SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above technologies have not given specific guidance on how to further improve the high temperature resistance and salt resistance

Method used

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  • Preparation method of micro-crosslinked-structure high-temperature-resistant salt-resistant well cementing cement slurry filtrate loss reducer
  • Preparation method of micro-crosslinked-structure high-temperature-resistant salt-resistant well cementing cement slurry filtrate loss reducer
  • Preparation method of micro-crosslinked-structure high-temperature-resistant salt-resistant well cementing cement slurry filtrate loss reducer

Examples

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Example Embodiment

[0022] Example 1: The preparation method of the micro-crosslinked structure, high temperature and salt resistance cement slurry fluid loss reducer of the present invention includes the following process steps: ① Weigh 2 according to the mass ratio of 21:5:3:1 -Acrylamido-2-methylpropanesulfonic acid, acrylamide, unsaturated polycarboxylic acid (itaconic acid), N-vinylpyrrolidone, these four materials are dissolved in deionized water to obtain a solution, and the pH of the solution is adjusted Value to 7 (30% NaOH solution can be used to adjust the pH value), add 0.2% of the total reactive monomers N, N-methylene bisacrylamide and the total reactive monomers 0.5% of the molecular weight regulator sodium methacrylic acid sulfonate, formulated into a solution with a monomer concentration of 20%. ②After that, pour the solution into a three-necked flask with a thermometer and a stirring device, and heat (react) in an oil bath to increase the temperature to 45°C. ③After the temperat...

Example Embodiment

[0023] Example 2: The preparation method of the micro-crosslinked structure, high temperature and salt resistance cement slurry fluid loss reducer of the present invention includes the following process steps: ①Weigh 2 according to the mass ratio of 19:4.5:2.5:1.2 -Acrylamido-2-methylpropanesulfonic acid, acrylamide, unsaturated polycarboxylic acid (maleic acid), N-vinylpyrrolidone, these four raw materials are dissolved in deionized water to obtain a solution, and the pH of the solution is adjusted Value to 6.5 (30% NaOH solution can be used to adjust the pH value), add the crosslinking agent N, N-methylene bisacrylamide which accounts for 0.13% of the total reactive monomers and the total reactive monomers It is 0.45% of the molecular weight regulator thioglycolic acid, formulated into a solution with a monomer concentration of 18%. ②Afterwards, pour this solution into a three-necked flask with a thermometer and a stirring device, and heat it in an oil bath to raise the tempe...

Example Embodiment

[0024] Example 3: The preparation method of the micro-crosslinked structure, high temperature and salt resistance cement slurry fluid loss reducer of the present invention includes the following process steps: ① Weigh 2 according to the mass ratio of 22:6.5:5:2 -Acrylamido-2-methylpropanesulfonic acid, acrylamide, unsaturated polycarboxylic acid (fumaric acid), N-vinylpyrrolidone, these four materials are dissolved in deionized water to obtain a solution, and the pH of the solution is adjusted Value to 7.5 (30% NaOH solution can be used to adjust the pH value), add the crosslinking agent N, N-methylene bisacrylamide which accounts for 0.18% of the total reactive monomers and the total reactive monomers It is 0.58% of the molecular weight regulator mercaptopropionic acid, formulated into a solution with a monomer concentration of 23%. ②Afterwards, pour this solution into a three-necked flask with a thermometer and a stirring device, and heat it in an oil bath to raise the temper...

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Abstract

The invention provides a preparation method of a micro-crosslinked-structure high-temperature-resistant salt-resistant well cementing cement slurry filtrate loss reducer. The preparation method includes following steps: respectively weighing 2-acrylamido-2-methyl propanesulfonic acid, acrylamide, unsaturated polybasic carboxylic acid and N-vinyl pyrrolidone, and dissolving in deionized water to obtain a solution; adjusting pH value of the solution to 6-8, adding a crosslinking agent and a molecular weight regulator, and finally preparing a solution of 15-25% in monomer concentration, wherein the crosslinking agent is N, N-methylene bisacrylamide, and the molecular weight regulator is one of sodium methallyl sulfonate, thioglycollic acid and thiohydracylic acid; heating the finally-prepared solution; after temperature is stable, adding an initiator into the solution, and continuing to react to obtain a liquid final product, wherein the initiator is composed of ammonium persulfate and L-ascorbic acid according to a mass ratio of 1.8-2.2:1. High-temperature resistance and salt resistance of the filtrate loss reducer prepared by the method are further improved, and the preparation method is simple in process, easy to operate, low in reaction temperature, energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to a preparation method of a cement slurry fluid loss reducer, in particular to a preparation method of a micro-crosslinked high temperature and salt resistant cement slurry fluid loss reducer. Background technique [0002] During cementing construction, the cement slurry is squeezed into the annular space, and when it flows through the permeable formation, filtration will occur, causing part of the liquid phase to leak into the formation. This process is called "water loss". If the water loss cannot be controlled, the pH value will be as high as 11.3-13.2, and the fluid lost by filtration will cause serious damage to the production layer, block the rock pores, and lead to the destruction of permeability, which will directly affect the production of oil wells; at the same time, after water loss The density of cement slurry increases, the consistency increases, the flow ability becomes worse, the thickening time is shortened, and i...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F220/56C08F222/02C08F226/10C09K8/487
CPCC08F220/58C08F220/585C09K8/487C08F220/56C08F222/02C08F226/10
Inventor 夏亮亮刘昭洋倪涛
Owner SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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